Transmission band



Jan. 15 1924.

G. R. HOFFMAN TRANSMISSION BAND Filed March 19. 1925 IN VEN TOR.

1?. HOFFMAN- ATTORNEYS.

Patented Jan. 15, 1924.

UNITED STATES PATENT OFFICE.

GLENN B. HOFFMAN, F SPRINGFIELD. ILLINOIS. ASSIGNOB. 1'0 HOFFMAN MANUFAC- TURING COMPANY, OF SPRINGFIELD, ILLINOIS, A CORPORATION OF ILLINOIS.

TRANSMISSION BAND.

Application filed March 19, 1923.

T 0 all whom it may (107266")7t.

Be it known that I, GLENN R. HOFFMAN, a citizen of the United States, residing at Springfield. in the county of Sangamon and 6 State of Illinois, have invented certain new and useful Improvements in Transmission Bands; and I do ,declare the following to be a full, clear, and exact description of the invention, such as will enable others 1 skilled in the art to which it appertains to make and use the same, reference beinghad to the a companying drawings, and to the letters and figures of reference marked thereon. which form a part of this specification.

v My invention relates to transmission bands, and more particularly to the ears of the bands. It has for its object to provide an ear construction that makes it possible to dispense with the extension of the pedal shaft from one ear to the other of the band as customary more particularly in the slowspeed band of the Ford type of transmission, and to give added strength to the band construction as a whole and also simplify the application of the band to its drum and its removal therefrom as Well as its operation in applying and releasing its frictional engagement with its drunn ln z-the Ford transmissions as at present in general use,

0 the low-speed pedal shaft sans the space between the two cars of the and and rests in the notched portions or ends of the ears and it supports the expansion sprin which tends to spread the ears apart, a threaded nut being employed for passin inward one of the ears to adjust the ban to its drum without drag, and a shoulder on the pedalshaft bears against the other ear to press inward that ear and contract the band on application of power through the pedal of the shaft as familiar to those acquainte with the Ford trans'i'zission. Under that construction when the band is to be removed from the drum for relining or other purposes, the pedal shaft has to be shifted through quite a range of movement to permit removal of the expansion spring and separation of the band-ears from the shaft to permit proper manipulation of the band for its removal from its drum. Under this construction it also happens at times that the band becomes worn to such an exten that it is liable to do damage to the drum as well as to itself before its defective conll dition becomes known e111? permanently attached ear;

Serial No. 626,086.

To overcome and obviate the dangers anddisadvantages adverted to, the present invention consists in the features of construction hereinafter particularly described and then sought to be clearly defined by the claims, reference being had to the accompanyingldrawing forming a part hereof and in who Figure 1 is a perspective view of the removable ear of the band formed according to the present invention;

Figure 2 is a like view of the other or usuband, with gure 3 is a perspective of a one ear detached.

In the drawings the numeral 1 designates the metal strap usually constituting a part of the band, and the lining 2 of woven fabric, or other suitable material, connected one to the other in any of the approved methods commonly employed. The removable ear is designated by the numeral 3, and comprises the shank 4 and out-turned ear 5.- This ear instead of being notched as usual to receive the pedal shaft is made solid with a stem 6 projecting from one face, and with a socket in its other face to receive the shoulder or lug usuall forming a art of the pedal shaft, so t at with the sioulder or lug fitting in the socket the ear and band will be prevented from moving out of line. This car is also preferably formed with a depending lug 8 adapted to fit in a socket on slot 9 owned in the metal strap 1 parallel with the folded end 10 of the band which forms an abutment for the end of the ear to bear against when the ear is locked to the band by head d studs 11 fitting in slots 12 formed in the s ank of the ear and the ear is drawn or slid on the band so as to brin the studs into d the reduced portions of the s ots and the lug 8 of the ear is caused to enter the slot 9 of the'strap l.

The ear 13 which is usually fixed or permanently attached to the transmission band, is formed with a solid out-turned end 14. instead of, as usual, with a notched end, and from one face projects a stem 15 and its opposite face is formed with a socket 16 to receive the end of the threaded adjusting nut (not shown) commonly employed in the Ford type of transmission for adjusting the band to its drum without drag.

Under the construction described the stem 6 of the removable ear and stem 15 of the permanent ear receive and support the expansion spring (not shown) which may be of any selected appropriate form to discharge its well known function. The threaded adjusting nut instead of receiving the end of the slow speed pedal shaft as customary will fit in the socket 16 and bear against the upturned end of the car so as adjust the band in proper position on its drum: and the pedal shaft instead of lying in a notched end of the ear against which the shoulder o lug of th shaft hears for compression purposes, will terminate with the shoulder usually formed thereon and the shoulder will fitdn the socket T and bear against the solid upturned car so that through means of the foot pedal the band will be contracted about its drum for the usual purpose.

In this construction the use of the lowspeed shaft for connecting the two cars of a low-speed transmission band is dispensed with entirely; and the adjacent ends of the two stems projecting from the ears may be so spined or distanced from each other when the band is adjustedto its drum that when the band lining becomes much worn r to a certain extent as to be liable to do damage to the faceof the drum the ends of the stems will meet or abut one against the other and prevent further contraction of the band and consequent damage to the face of the drum.

essential features of the invention retained.

Having described my invention and set forth its merits what I claim is:

1. A transmission bandprovided with ears having out-turned ends formed on their ad jacent faces with projecting stems adapted to receive an expansion spring, one of the ears being detachable.

2. A transmission band provided with ears having out-turned ends formed on their adjacent faces with projecting stems adapted to receive an expansion spring, said stems being in line one with the other and spaced apart for meeting contact to restrict contraction of the band. a

3. A transmission band rovided with ears having out-turned ends fiirmed on their adjacent faces with projecting stems adapted to receive an expansion spring,and with means on their other faces adapted to receive band contracting means.

4. A transmission band provided with ears having out-turned ends, one of said ears being removable and having a stem projecting from one face and means on its other face to receive part of a pedal-shaft to con- This construction also lessens liability ofwtract the band.

breakage of the expansion spring. It also facilitates the installation and removal of the transmission band, and makes'possible the easier installation of the bands of the reverse and the brake drums, and results in a savi of time, labor and expense in removal ofthebands for repairs to the linings In testimony whereof I affix my signa ture in presence of two witnesses.

GLENN R. HOFFMAN.

Witnesses:

ROY B. MoKown, DAVID H. PAULDING. 

